fix: adjust default threshold to 0.62 for high sensitivity on mild dementia

fix: remove probability inversion, align thresholds with notebook (0.70/0.75/0.62)

Fix model download repo env var and update UI colors

Fix model download repo env var and update UI colors

Fix model download repo env var and update UI colors

Fix: tune clinical thresholds to model output range (0.60-0.80), set default threshold=0.70

Deploy UI without demo images, update app backend probability inversion

Fix model download repo env var and update UI colors

Improve sidebar layout to remove generic AI aesthetic

Deploy NeuroSSL dementia classifier application